//
//  NavigationController.h
//  BackgroundDownload
//
//  Created by hodor on 2019/7/4.
//  Copyright © 2019 王松锋. All rights reserved.
//

#import <UIKit/UIKit.h>

NS_ASSUME_NONNULL_BEGIN
@protocol BackButtonHandlerProtocol <NSObject>

@optional
/**
 导航栏返回按钮点击事件，默认返回上一级，如有特殊操作可调用此方法
 */
- (void)back;

@end

@interface UIViewController (customBackPopButton)<BackButtonHandlerProtocol>

@end

@interface NavigationController : UINavigationController

@end

NS_ASSUME_NONNULL_END
